My old Ayon CD-5s with Burson single HD discrete op amps, matched 6C4P rectifiers & cryo'd EH 6H30 Gold pins. The gold pins are warmer, lusher sounding tubes. Don't neglect the importance of cables either. I found Jorma Prime sounded harmonically rich, on the warm side and liquid sounding. OTOH Jorma Origo is a bit more neutral if you don't want any more warmth.
